In 2020, due to the discontinuation of Adobe Flash, Poptropica began porting islands that were built in Adobe Flash over to an HTML5 format. However, because Poptropica utilized a variety of different Flash engines, several islands couldn't be ported immediately and were effectively removed from the game. Fortunately, fan archivists later made 35 of the removed islands playable again via the Basilisk browser within the Flashpoint program.

In April 2022, it was announced that some of the old islands would return as part of a bundle released on Steam. Although it was delayed by a day, the Steam version of Poptropica was released on May 26, and included seventeen islands and Poptropica Realms.